With heat waves coming and going throughout the summer, you’re going to have times when you just want to stay inside and try to keep cool. Rather than delve into mindless TV, turn that into educational time with a Curiosity Stream Standard Plan. During our version of Prime Day, you can get it for a one-time payment that’s more than $200 off. Curiosity Stream was launched by Discovery Communications co-founder John Hendricks. Today, it’s full of thousands of documentaries and docuseries covering every subject under the sun (and beyond the sun). You can download content for offline viewing, enjo…